Grinding machine



GRINDING MACHINE Filed Nov. 18, 1926 2 /f 3l /7 [l 2; /7 /f 2 /5 22 n 22 z5 /Z a; 5 /7 ec- 0"@ n 2B 28 27 25 Z4 INVENTOR 29 HENRY QSCH EIDER ATTORN EY ylaeminil Feb. 4, 1930 UNITED STATES PATENT OFFICE IIENnY c. scHNEIDEI't, or BELOIT, WISCONSIN, AssIGNOa 'ro IAIRBANKS, MORSE e OO., or OIIIOAGO, ILLINOIS, A CORPORATION or ILLINOIS GRINDING MACHINE y Application flied November 18, 1926. Serial No. 149,129.

My invention relates to improvements iI grinding machines andmore particularly to improvements in grinders of the revolving knife or hammer type, in which the grinding action is secured by the impact of revolving knives against the material to be ground.

An object of my invention is to provide a grinder ofthe class described'which provides a maximum ease of assembly and repair and includes a novel means 'for mounting the knives, spacers, bearing and pulley upon the shaft so that the 'entire assembly is clamped together by means of one set of lock nuts.

Another object ofmy invention is to provide, in a grinder of the class described, a cutting knife or hammer which is double ended and reversible and which is so constructed as to present a plurality of cutting edges at each end of the knife or hammer. y

Another object of my invention is to provide, in a grinder of the class described, a novel bearing assembly which is simple and economical to construct and which provides for maximum ease of aligning the shaft, as well as to insure the permanent alignment of shaft, bearing assemblies and the frame.

Further objects and advantages of my invention will appear from the drawings andl the following description thereof.

Although my invention consists largely in the construction and arrangement of parts hereinafter described and particularly pointed out in the claims, yet I do not limit my invention to the precise form or construction ofparts shown or the several4 parts thereof, inasmuch as various alterations may be made without changing the scope of my invention.

In the drawings Fi 1 is a side elevation, partially in section, o an approved form of my device; Fig. 2 is a 'sectional View taken along the line 2,-2 in Fig. 1; Fig. 3 is a plan view of an' approved form of hammer or cutting knife; Fig. 4 isan elevational view of Fig. 3; and Fig. 5 is a plan view of one of my spacers. A

Referring by numerals to thedrawings, 10 represents an approved form of shaft for my device on which are mounted the hammers or cutting knives 11. Hammers 11 are pref- 50 erably loosely mounted on shaft 10 and sepalend of the shaft.

rated] fromeachother by means of spacers 12 preferably keyed to shaft 10. 13 designates the` bearings for the shaft preferably separated from the hammer and spacer assembly by lmeans of end-spacers or separators 14 which are preferably adapted to fit over shoulder 15 Aon shaft' 10. Separators 16 in contact with bearings 13 at their outer end serve to separate the bearings from the pulley- 17 at one end of the shaft and end-piece 18 at the other end of the shaft. Nuts 19 preferably serve to clamp the whole assembly together. It will be seen that in my assembly, the hammers or knives l1 are caused to rotate with shaft 10 by means of the friction between the spacers which are keyed to the shaft, and the hammers, so that while the hammers are normally rigid with respect to the shaft for grinding purposes, they may be capable of a certain amount of movement with respect to the shaft should they come into contact with foreign obstacles introduced with the material to be ground, such as pieces of metal, rocks and the like. Such a means of mounting the hammers adds greatly to their life. It will also be seen lthat the hammers, spacers, bearings, pulley and end blocks'are all held onto the shaft by a single set of right and left-handed nuts at either Suche construction re- 80 quires a'minimum number of parts, is quick and easy to assemble, shortens the over-all length of the machine, and makes it possible to employy a shaft which is heavier at the ends than those heretofore employed, since 85 the diameter of the shaft does not havey to be reduced in order 4to O'ive clearance to extra clamping nuts or thezlike.

Hammers 11 are preferably constituted with split ends so as to form a plurality of cutting (ends 20y at' each end of the hammer, thereby providing a plurality of cutting edges 21 in either direction. It will be seen that with my construction the hammers are readily reversible, thereby giving double life to the hammer, and that with my split-end construction the cutting area is'greatly increased.

As a means for mounting my shaft and assembly I prefer to employ 'lower bearing 100 halves 22 resting in bearing plates 23 of supporting frame 24, and' upper bearing halves 25 attached to the lower halves in anysuitable manner, ysuch as by straps 26 and bolts 27. It will be seen that by my construction it is only necessary to remove straps 26 `and upper bearing halves 25 to make thc complete shaft assembly removable in one piece. prefer to employ spherical surfaces for the bearing plates 23, since with this construction these various members may be castso as not to require.machining. By employing self-aligning ball-bearings 13 resting within the bearing halves 22 and 25 the proper alignment of the shaft and assembly is always assured.

I prefer to employ a screen 27 e partially surrounding the knives 11 and removably positioned below them with the necessary clearance. This screen 27 may be attached to frame 24 in any suitable manner such as by means of ledges 28. The perforations in this screenrmay be of any suitable size to accommodate the size of material to be ground and the size of the finished product desired. Below screen 27 and attached to frame 24 in any suitable manner, I prefer to employ7 an outlet chute or hopper 29. A preferred form of upper housing or cover portion is shown at 30 and is preferably pivoted to frame 24 by means of bolt 31. Lugs 32 on housing 30 and bolts 33 on frame 24 preferably serve to hold housing 30 in place over the knives and it is evident that by removing nuts 34011 bolts 33 the whole cover portion 30 may be swung about pivot 31 to renderl the entire inner mechanism accessible. An adjustable inlet chute is shown at 34 which leads into opening 35 in housing 30. As a means for adjusting the slope of chute 34 I prefer to e`mploy props 36 carried by pivot bolt 31 and having a cross bar 37 adapted to fit'in notched member 38.

It will be seen that the machine above described by way of example, affords a sub-` stantial construction, is composed of few parts and will requirea minimum of adj ustment and attention; if repairs become necessary all moving parts may be removed from the frame as a unit.

I claim:

1. In a device of the class described, a rotatable shaft, a pulley therefor, a grinding member on said shaft, a spacer on said shaft, and

a means on said shaft adaptedl to retain said grinding member adjacent said spacer, said means being adapted to attach said pulley to said shaft. j

2. In a device of the class described, a grinding assembly comprising a shaft, a pulley/therefor, a bearing mem er, a grinding member, a spacer between` said members and x a means adapted to effect a lfrictional driving `lelationbetween said spacer and said driving member and to secure said pulley, bearhalves 22 and 25 and the bearinging member, grinding member and spacer on said shaft.

3. In a device of the class described, a rotatable shaft, a cutting knife on said shaft, a spacer carried by said shaft on each side of said knife, a pulley, means for clamping said knife'between said spacers whereby the knife I will rotate with the shaft, said means being adapted to attach said pulle on said shaft.

4. In a device of the c ass descr1bed,`a rotatable shaft, a cutting knife` mounted on said shaft, spacers attached to said shaft for rotation therewith, and disposed on each side of said knife, means for clamping said knife between saidspacers whereby said knife will be rotated by frictional engagement with said spacers. l

5. In a device of the class described, a removable grinding assembly comprising a rotatable shaft, a bearing therefor, a cutting 4 member on said shaft, means for frictionally and yieldably driving said cutting member, said means including spacers attached to said 'shaft on each side of said cutting member and bearing, and means for clamping said member between said spacers whereby said bearing lis axially positioned on, and said member will rotate with, the shaft.

6. In a device of the class described, a

vdemountable grinding assembly including a shaft, a cutting knife on said shaft, aspacer attached to said shaft on each side of said cutting knife, a bearing on said shaft on each side of the cutting knife, a separator between each of said bearings and the adjacent spacer, a pulley on said shaft, means for clamping said knife between said spacers, whereby the knife will rotate with the shaft, saidmeans being adapted to attach said bearing, said pulley and said knife to the shaft.

7. In a device of the class described, a demountable and removable assembly of operating parts including a shaft, bearings for said shaft, a plurality of cutting elements, means for yieldingly positioning and frictionally rotating said elements, said means including spacers keyed to the shaft adjacent said elementsand threaded means adapted to position said bearings, cutting elements and spacers on said shaft.

HENRY C. SCHNEIDER. 

